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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
New Accounting Standard, Hypothetical Retrospective Adjustment   $ 41.3  
Unamortized Debt Issuance Expense   18.1  
Bank Servicing Fees $ 37.0 7.9 $ 2.5
Restricted Cash and Cash Equivalents 72.2 75.6  
Redeemable Noncontrolling Interest 6.8 11.1 13.4
Redeemable Noncontrolling Interest, Acquisition Date Fair Value (3.6) (2.8)  
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest 0.1 1.6  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest 0.8 (1.1)  
Effect of Exchange Rate on Cash and Cash Equivalents 7.0 16.6 10.3
Unrecognized Tax Benefits 37.6 28.3 48.5
Depreciation 117.7 97.2 84.2
Unbilled Contracts Receivable 402.9 374.6  
Gross and Net Accounting [Abstract]      
Gross revenue and expenses for management services 1,023.5 801.3 727.9
Mortgage servicing rights $ 160.8 163.0  
Investments in Real Estate Ventures [Abstract]      
Minimum ownership percentage in real estate ventures (in hundredths) 1.00%    
Maximum ownership percentage in real estate ventures (in hundredths) 10.00%    
Unrealized gain on investments for which fair value option is elected $ 16.6 21.1 7.1
Derivatives and Hedging Activities [Abstract]      
Foreign currency forward contracts, net notional value 1,390.0 1,260.0  
Foreign Currency Transaction Gain (Loss), Unrealized (14.2) (11.7) 7.7
Derivative, Notional Amount 1,900.0 2,280.0  
Foreign Currency Translation [Abstract]      
Accumulated other comprehensive loss (551.1) (336.3)  
Net foreign currency gains (losses) 6.2 (2.0) $ (8.5)
Fair Value, Estimate Not Practicable, Mortgage-backed Securities Held-to-maturity 180.0 167.2  
Line of Credit [Member]      
Unamortized Debt Issuance Expense 19.6 15.4  
Long-Term Senior Notes [Member]      
Unamortized Debt Issuance Expense 2.3 2.7  
Additional Paid-in Capital [Member]      
Redeemable Noncontrolling Interest, Acquisition Date Fair Value (0.8) (0.2)  
Redeemable Noncontrolling Interest, Equity, Redemption Value $ 0.8 $ 0.2